US4627114A - Shock attenuation structure - Google Patents

Shock attenuation structure Download PDF

Info

Publication number
US4627114A
US4627114A US06/643,429 US64342984A US4627114A US 4627114 A US4627114 A US 4627114A US 64342984 A US64342984 A US 64342984A US 4627114 A US4627114 A US 4627114A
Authority
US
United States
Prior art keywords
layers
set forth
shock
impact
protective apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/643,429
Inventor
Hal D. Mitchell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scott Technologies Inc
Original Assignee
Figgie International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Figgie International Inc filed Critical Figgie International Inc
Assigned to FIGGIE INTERNATIONAL INC. reassignment FIGGIE INTERNATIONAL INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MITCHELL, HAL D.
Priority to US06/643,429 priority Critical patent/US4627114A/en
Priority to JP60503600A priority patent/JPS62500037A/en
Priority to PCT/US1985/001448 priority patent/WO1986001380A1/en
Priority to EP19850904032 priority patent/EP0190281A4/en
Priority to CA000489139A priority patent/CA1245801A/en
Publication of US4627114A publication Critical patent/US4627114A/en
Application granted granted Critical
Assigned to FIGGIE INTERNATIONAL INC. reassignment FIGGIE INTERNATIONAL INC. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: DECEMBER 31, 1986 Assignors: FIGGIE INTERNATIONAL INC., (MERGED INTO) FIGGIE INTERNATIONAL HOLDINGS INC. (CHANGED TO)
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT reassignment GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAWLINGS SPORTING GOODS COMPANY, INC.
Assigned to RAWLINGS SPORTING GOODS COMPANY, INC. reassignment RAWLINGS SPORTING GOODS COMPANY, INC. TERMINATION AND RELEASE OF SECURITY INTEREST IN PA Assignors: GENERAL ELECTRIC CAPITAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A42HEADWEAR
    • A42BHATS; HEAD COVERINGS
    • A42B3/00Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04Parts, details or accessories of helmets
    • A42B3/10Linings
    • A42B3/12Cushioning devices
    • A42B3/125Cushioning devices with a padded structure, e.g. foam
    • A42B3/128Cushioning devices with a padded structure, e.g. foam with zones of different density
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S2/00Apparel
    • Y10S2/908Guard or protector having a hook-loop type fastener
    • Y10S2/909Head protector, e.g. helmet, goggles

Definitions

  • the present invention relates generally to shock attenuation structure useful in protective headgear (e.g., football and aviation helmets), running shoes and other shock-attenuating applications, and more particularly to such structure wherein shock attenuation is accomplished by the deformation of a series of side-by-side layers having alternating high and low compression resistances.
  • protective headgear e.g., football and aviation helmets
  • running shoes e.g., running shoes
  • shock attenuation is accomplished by the deformation of a series of side-by-side layers having alternating high and low compression resistances.
  • shock attenuation systems have been developed for absorbing shock.
  • Some systems such as the safety hat shown in U.S. Pat. No. 3,877,076, comprise permanently deformable (i.e., crushable) shock absorbing material, such as foamed polystyrene, which is very effective in attenuating shock but which is not designed to absorb repeated impacts.
  • Other systems comprise resilient shock-absorbing material capable of absorbing repeated impact loadings.
  • the use of resilient material may pose a problem in that when it is deformed during an impact, a substantial amount of energy is stored (rather than dissipated) and then released as the material rebounds or returns to its original undeformed shape. This release of energy, sometimes referred to as the "rebound effect", may be transmitted back to the item being protected (e.g., the head in the case of headgear) and result in considerable shock to the item.
  • an improved shock attenuation structure wherein shock is attenuated by the deformation of a series of side-by-side layers of shock absorbing material having alternating high and low compression resistances; the provision of such a structure which provides a higher level of shock attenuation than prior systems; the provision of such a structure which continues to provide a higher level of shock attenuation after repeated impact loadings; the provision of such a structure which minimizes the "rebound effect"; and the provision of such a structure which is relatively compact and lightweight compared to prior art systems.
  • a shock attenuation structure of the present invention has a breadth greater than its thickness and a breadthwise cross section comprising a series of layers arranged side-by-side comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of said first plurality.
  • the structure is adapted to be mounted with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, the layers in the area of impact being adapted to deform for attenuating the shock resulting from the impact.
  • a more specific aspect of the present invention involves protective apparatus for the head comprising a shell of substantially rigid material adapted to fit on the head and a plurality of separate shock attenuating modules disposed around the inside of the shell for protecting the head, at least one of said modules comprising a shock attenuating structure having a breadth greater than its thickness, a breadthwise cross section comprising a series of layers arranged side-by-side, said series comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of the first plurality, said structure being mounted on the inside of the shell with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, said layers in the area of impact being adapted to deform for attenuating the shock resulting from said impact.
  • FIG. 1 is a front view of a protective helmet having a shock attenuation system comprising shock attenuation structures of the present invention, portions of the helmet and shock attenuation system being broken away for purposes of illustration;
  • FIG. 2 is a bottom view of the helmet shown in FIG. 1 showing, among other things, a shock attenuation structure at the crown of the shell, portions of the structure being broken away to illustrate details;
  • FIG. 3 is a vertical section taken through the helmet in side-to-side direction with portions broken away;
  • FIG. 4 is a vertical section on line 4--4 of FIG. 1, with portions broken away;
  • FIG. 5 is an enlarged portion of FIG. 4 showing a shock attenuation structure of this invention.
  • FIG. 6 is a view similar to FIG. 5 showing the shock attenuation structure when subjected to an impact force.
  • protective apparatus in the form of headgear (a football helmet as shown) comprising an outer impact-receiving member or shell 3, which may be of a suitable substantially rigid material, such as resin-impregnated fiberglass, having a relatively high resistance to impact.
  • a shock attenuation system of this invention, generally designated S, is provided on the inside of the shell for attenuating the shock on the head resulting from an impact (or impacts) on the shell.
  • the shock attenuation system S comprises five separate shock attenuation modules or pads 7, 9, 11, 13 and 15 secured to the interior surface of the shell 3 at positions corresponding to the front (forehead), back, left and right sides, and top of the head, respectively.
  • the two pads 11, 13 at the sides of the helmet are generally rectangular in shape and curved to conform to the inside surface of the shell. They are located above the ear flaps 17 of the helmet and are constructed in accordance with the invention described in co-assigned U.S. Pat. No. 4,558,470.
  • each side pad 11,13 contains a plurality of shock attenuating columns 19 integrally molded with and projecting outwardly toward the shell 3 from one face of a carrier sheet 21, the columns being disposed with their axes generally at right angles to the shell.
  • the columns 19 are arrayed on the carrier sheet in a plurality of generally parallel rows (e.g., four rows of seven columns each as shown in FIG. 4), the spacing between adjacent columns in a row and the spacing between adjacent rows of columns being substantially equal.
  • Each column is tubular in shape, open at its inner end, closed at its outer end, and formed of a substantially resilient elastomeric material, such as vinyl, urethane, or polyethylene. All of the columns in the array are of substantially uniform diameter and length and have square-cut ends, i.e., the ends of each column lie in planes generally perpendicular to the central axis of the column.
  • Each of the two side pads 11, 13 further comprises an outer facing layer 23 of a suitable fabric, for example, adjacent the interior surface of the shell 3, a relatively thick layer 27 of cushioning material, such as a vinyl nitrile foam of the type sold under the trade designation "326 Rubatex" by Rubatex Corporation of Bedford, Va., a separate layer 29 of cushioning material, and an inner facing layer 31 of suitable material, such as leather, engageable by the head of a person wearing the helmet.
  • the carrier sheet 21 is disposed between layers 27 and 29 and the columns 19 project outwardly from the carrier sheet through the cushioning layer 27, the latter of which has a thickness generally equal to the length of the columns.
  • Side pads 11 and 13 are designed to attenuate the shock on the sides of the head of the wearer resulting from an impact on the shell.
  • the columns 19 of each side pad are disposed for axial loading during impact and are so dimensioned and configured that, when subjected to an axial impact force of predetermined magnitude, they are adapted resiliently to deform for attenuating the shock resulting from the force of impact.
  • the columns are believed to compress axially, that is, their effective length as measured in the direction perpendicular to the carrier sheet 21 decreases.
  • the front and back pads 7, 9 have a construction different from the side pads 11, 13 described above. Both pads are generally rectangular in shape and, like side pads 11 and 13, are curved to conform to the inside surface of the shell, as shown in FIG. 2.
  • Each pad comprises an outer facing layer 35 of fabric, for example, facing the inside surface of the shell, a central shock attenuating structure, generally designated 37, a layer 39 of cushioning material (e.g., a vinyl nitrite foam of the type described above with respect to layer 27 of side pads 11, 13) and an inner facing layer 41 of leather, for example, encasing the sides of the pad and the inner face of the pad, the latter of which is engageable by the head of a person wearing the helmet.
  • cushioning material e.g., a vinyl nitrite foam of the type described above with respect to layer 27 of side pads 11, 13
  • an inner facing layer 41 of leather for example, encasing the sides of the pad and the inner face of the pad, the latter of which is engageable by the head of a
  • the central shock attenuation structure 37 of each of the front and back pads 7,9 has a breadth (width) greater than its thickness and a breadthwise (widthwise or vertical as shown in the drawings) cross section comprising a series of layers arranged in contiguous side by side relation, the layers being formed by a first plurality of strips, each designated 43, of shock-absorbing material having a relatively high resistance to compression, and a second plurality of strips, each designated 45, of shock-absorbing material having a lower resistance to compression. Layers 45 alternate with layers 43 across the breadth (width) of the structure 37 (vertically as shown in FIG. 4).
  • Strips or layers 43 are preferably of a resilient material, such as a high-density relatively slow-recovery foam.
  • Strips or layers 45 are also preferably of a resilient material, such as a low-density relatively fast-recovery foam.
  • Strips 43 and 45 are suitably joined together at their sides to form a unitary structure.
  • Strips 43 and 45 may be bonded together by adhesive, for example, such as a polyurethane adhesive sold under the trade designation M6586 by Midwest Chemical Company of St. Louis, Mo.
  • layers 43 and 45 are generally rectangular, each layer having a major dimension D1, constituting its height, and a minor dimension D2, constituting its width or thickness, less than D1.
  • the layers are arranged with their major dimensions D1 generally parallel and extending generally in the direction of the thickness of the structure so that the height of the layers generally corresponds to the thickness of the structure.
  • the major dimension D1 of the layers extends generally at right angles to the inside surface of the shell so that the breadth of the pad is generally perpendicular to the direction of impact force for broadside loading of the structure during an impact.
  • the layers 43,45 of a respective pad 7, 9 are adapted to deform in the area of impact for attenuating the shock resulting therefrom. Since layers 43 are of a material having a relatively high resistance to compression, they will absorb most of the impact force by compressing and by deflecting laterally, as shown in FIG. 6. However, layers 45 also absorb some impact force. More importantly, layers 45 provide substantial lateral support to layers 43 and thereby increase the latter's ability to resist lateral deflection and thus to attenuate shock.
  • the lateral support provided by layers 45 together with the fact that layers 43 are preferably of a relatively slow-recovery material, minimizes the "rebound effect" (i.e., the shock felt by the wearer as the shock-absorbing material returns to its undeformed state).
  • Top pad 15 has a construction similar to that of front and back pads 7 and 9, and corresponding parts are designated by the same reference numerals.
  • the principle difference between pad 15 and pads 7 and 9 is that the structure 37 of pad 15, instead of being formed by numerous relatively narrow strips joined together side by side, is formed by only two such strips joined (e.g., adhesively bonded) at their sides and coiled in spiral form, one strip of the pair, as coiled, forming layers 43 and the other strip of the pair, as coiled, forming layers 45.
  • the convolutions of the coiled strips are also joined (as by adhesive bonding) to form a unitary structure.
  • Structure 37 of pad 15 functions to a attenuate shock in the same manner as structure 37 of pads 7 and 9.
  • Pad 15 is slightly dished in shape to conform to the crown contour of the helmet.
  • An important advantage of this invention is that, given a set of design parameters, the system S may be engineered to meet virtually any performance requirement over a wide range of requirements.
  • pads 7, 9 and 15 for example, this may be accomplished by varying the physical properties and characteristics of layers 39 and 41, such as the materials out of which they are made, and the cross-sectional dimensions of the layers.
  • layers 39 and 41 such as the materials out of which they are made, and the cross-sectional dimensions of the layers.
  • layers 43 and 45 of pad 7 are preferably of relatively stiff materials for more effectively absorbing the greater loads.
  • layers 43 could be of a high-density relatively slow-recovery polyurethane adhesive, such as is available from Midwest Chemical Company of St. Louis, Mo. under the trade designation M6586, and layers 45 of a high-density (e.g., 2-4 lbs/ft. 3 ) relatively slow-recovery foam such as an ionomer sold under the trade designation "Surlyn" by Gilman Brothers Company of Gilman, Conn.
  • front pad 7 could have a construction identical to the side pads 11, 13.
  • layers 43 could be of a high-density (e.g., 12 lbs/ft 3 ) relatively slow-recovery foam such as an ionomer sold under the trade designation "Surlyn” by Gilman Brothers Company of Gilman, Conn., and layers 45 could be a low-density (e.g., 2-4 lbs/ft 3 ) relatively fast-recovery foam such as ethylene vinylacetate sold under the trade designation "Evalite” by Monarch Rubber Co. of Bolt, Md.
  • a high-density e.g., 12 lbs/ft 3
  • relatively slow-recovery foam such as an ionomer sold under the trade designation "Surlyn” by Gilman Brothers Company of Gilman, Conn.
  • layers 45 could be a low-density (e.g., 2-4 lbs/ft 3 ) relatively fast-recovery foam such as ethylene vinylacetate sold under the trade designation "Evalite” by Monarch Rubber Co. of Bol
  • layers 43 and/or 45 While the materials discussed above are resilient, the use of permanently-deformable non-resilient materials to fabricate layers 43 and/or 45 is also contemplated, at least under certain circumstances, as where the impact loadings are at very high levels. Under such conditions, it has been found that layers 43, for example, may be formed by strips of paper or thin slices of wood.
  • layers 43 and 45 are also believed to have an important effect on the ability of structure 37 to absorb and attenuate shock. It is believed, for example, that for maximum effectiveness in attenuating shock, layers 43 should have a slenderness ratio (i.e., the ratio of D1/D2) of 1.0 or greater, so that the layers will not only compress but also tend to buckle (as viewed in cross section) under loading to more effectively absorb the energy of impact. Generally speaking, as the impact load increases, the slenderness ratio of layers 43 should also increase and layers 43 should be formed from materials having a higher resistance to compression in the direction of the loading, thus making structure 37 stiffer for more effectively absorbing the higher impact energies involved. With respect to layers 45, they too should generally have a slenderness ratio of 1.0 or greater, with the slenderness ratio increasing as the impact load increases.
  • Each pad 7, 9, 11, 13 and 15 is removably mounted on the inside of shell 3 by fastening means comprising one or more two-part fasteners, one part, in the form of a patch 51, of each fastener being secured (e.g., glued) to the respective outer faces 23 or 35 of the pads, and the other part, in the form of a patch 53, of each fastener being secured (e.g., glued) to the interior surface of the shell 3.
  • the two patches 51, 53 of each fastener are preferably formed from a fabric fastening material available commercially under the trademark VELCRO, such as shown in Mestral U.S. Pat. No. 2,717,431, issued Sept. 13, 1955.
  • the patches have cooperable fastening elements thereon which are interengageable for fastening the pad to the shell, and disengageable for removal of the pad from the shell (as for inspection and replacement, if necessary).
  • additional VELCRO patches 53, or even continuous VELCRO strips may be placed around the interior surface of the shell so that the position of the pads may be adjusted to fit the head of the particular person wearing the headgear.
  • the front pad 7 is further secured to the helmet by a strip of webbing 55 fastened to the outer surface of the helmet at its front. Other means for fastening the pads to the helmet may also be used.

Landscapes

  • Laminated Bodies (AREA)
  • Vibration Dampers (AREA)
  • Helmets And Other Head Coverings (AREA)

Abstract

A shock attenuation structure having a breadth greater than its thickness and a breadthwise cross section comprising a series of layers arranged side-by-side. The series of layers comprises a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of the second plurality alternating with the layers of the first plurality across the breadth of the structure and providing lateral support to the layers of the first plurality. The structure is adapted to be mounted with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, the layers in the area of impact being adapted to deform for attenuating the shock resulting from the impact.

Description

BACKGROUND OF THE INVENTION
The present invention relates generally to shock attenuation structure useful in protective headgear (e.g., football and aviation helmets), running shoes and other shock-attenuating applications, and more particularly to such structure wherein shock attenuation is accomplished by the deformation of a series of side-by-side layers having alternating high and low compression resistances.
Various shock attenuation systems have been developed for absorbing shock. Some systems, such as the safety hat shown in U.S. Pat. No. 3,877,076, comprise permanently deformable (i.e., crushable) shock absorbing material, such as foamed polystyrene, which is very effective in attenuating shock but which is not designed to absorb repeated impacts. Other systems comprise resilient shock-absorbing material capable of absorbing repeated impact loadings. However, the use of resilient material may pose a problem in that when it is deformed during an impact, a substantial amount of energy is stored (rather than dissipated) and then released as the material rebounds or returns to its original undeformed shape. This release of energy, sometimes referred to as the "rebound effect", may be transmitted back to the item being protected (e.g., the head in the case of headgear) and result in considerable shock to the item.
Reference may be made to co-assigned U.S. Pat. Nos. 4,558,470; 4,484,364 and 4,534,068 for shock attenuation systems generally in the field of this invention. U.S. Pat. Nos. 882,686, 1,652,776 and 4,343,047 also show various types of shock attenuation apparatus which may be considered generally relevant to the present invention.
SUMMARY OF THE INVENTION
Among the several objects of this invention may be noted the provision of an improved shock attenuation structure wherein shock is attenuated by the deformation of a series of side-by-side layers of shock absorbing material having alternating high and low compression resistances; the provision of such a structure which provides a higher level of shock attenuation than prior systems; the provision of such a structure which continues to provide a higher level of shock attenuation after repeated impact loadings; the provision of such a structure which minimizes the "rebound effect"; and the provision of such a structure which is relatively compact and lightweight compared to prior art systems.
Generally, a shock attenuation structure of the present invention has a breadth greater than its thickness and a breadthwise cross section comprising a series of layers arranged side-by-side comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of said first plurality. The structure is adapted to be mounted with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, the layers in the area of impact being adapted to deform for attenuating the shock resulting from the impact.
A more specific aspect of the present invention involves protective apparatus for the head comprising a shell of substantially rigid material adapted to fit on the head and a plurality of separate shock attenuating modules disposed around the inside of the shell for protecting the head, at least one of said modules comprising a shock attenuating structure having a breadth greater than its thickness, a breadthwise cross section comprising a series of layers arranged side-by-side, said series comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of the first plurality, said structure being mounted on the inside of the shell with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, said layers in the area of impact being adapted to deform for attenuating the shock resulting from said impact.
Other objects and features will be in part apparent and in part pointed out hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of a protective helmet having a shock attenuation system comprising shock attenuation structures of the present invention, portions of the helmet and shock attenuation system being broken away for purposes of illustration;
FIG. 2 is a bottom view of the helmet shown in FIG. 1 showing, among other things, a shock attenuation structure at the crown of the shell, portions of the structure being broken away to illustrate details;
FIG. 3 is a vertical section taken through the helmet in side-to-side direction with portions broken away;
FIG. 4 is a vertical section on line 4--4 of FIG. 1, with portions broken away;
FIG. 5 is an enlarged portion of FIG. 4 showing a shock attenuation structure of this invention; and
FIG. 6 is a view similar to FIG. 5 showing the shock attenuation structure when subjected to an impact force.
Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings, there is generally indicated at 1 protective apparatus in the form of headgear (a football helmet as shown) comprising an outer impact-receiving member or shell 3, which may be of a suitable substantially rigid material, such as resin-impregnated fiberglass, having a relatively high resistance to impact. A shock attenuation system of this invention, generally designated S, is provided on the inside of the shell for attenuating the shock on the head resulting from an impact (or impacts) on the shell.
As incorporated in the headgear shown in the drawings, the shock attenuation system S comprises five separate shock attenuation modules or pads 7, 9, 11, 13 and 15 secured to the interior surface of the shell 3 at positions corresponding to the front (forehead), back, left and right sides, and top of the head, respectively. The two pads 11, 13 at the sides of the helmet are generally rectangular in shape and curved to conform to the inside surface of the shell. They are located above the ear flaps 17 of the helmet and are constructed in accordance with the invention described in co-assigned U.S. Pat. No. 4,558,470.
More specifically, each side pad 11,13 contains a plurality of shock attenuating columns 19 integrally molded with and projecting outwardly toward the shell 3 from one face of a carrier sheet 21, the columns being disposed with their axes generally at right angles to the shell. The columns 19 are arrayed on the carrier sheet in a plurality of generally parallel rows (e.g., four rows of seven columns each as shown in FIG. 4), the spacing between adjacent columns in a row and the spacing between adjacent rows of columns being substantially equal. Each column is tubular in shape, open at its inner end, closed at its outer end, and formed of a substantially resilient elastomeric material, such as vinyl, urethane, or polyethylene. All of the columns in the array are of substantially uniform diameter and length and have square-cut ends, i.e., the ends of each column lie in planes generally perpendicular to the central axis of the column.
Each of the two side pads 11, 13 further comprises an outer facing layer 23 of a suitable fabric, for example, adjacent the interior surface of the shell 3, a relatively thick layer 27 of cushioning material, such as a vinyl nitrile foam of the type sold under the trade designation "326 Rubatex" by Rubatex Corporation of Bedford, Va., a separate layer 29 of cushioning material, and an inner facing layer 31 of suitable material, such as leather, engageable by the head of a person wearing the helmet. The carrier sheet 21 is disposed between layers 27 and 29 and the columns 19 project outwardly from the carrier sheet through the cushioning layer 27, the latter of which has a thickness generally equal to the length of the columns.
Side pads 11 and 13 are designed to attenuate the shock on the sides of the head of the wearer resulting from an impact on the shell. It will be noted in this regard that the columns 19 of each side pad are disposed for axial loading during impact and are so dimensioned and configured that, when subjected to an axial impact force of predetermined magnitude, they are adapted resiliently to deform for attenuating the shock resulting from the force of impact. During the initial stages of such deformation, the columns are believed to compress axially, that is, their effective length as measured in the direction perpendicular to the carrier sheet 21 decreases. This decrease is believed to be effected by a bending of the column walls without a substantial increase in the density of the wall material, although it is possible that some actual increase in wall density may occur. During the latter stages of the deformation process, the columns deflect laterally or buckle under the force of impact. This buckling is on a random basis and usually begins with a local crippling at some part of each column. After the impact force has dissipated, the columns are then adapted to spring back substantially to their undeformed (FIG. 1) shape.
As shown, the front and back pads 7, 9 have a construction different from the side pads 11, 13 described above. Both pads are generally rectangular in shape and, like side pads 11 and 13, are curved to conform to the inside surface of the shell, as shown in FIG. 2. Each pad comprises an outer facing layer 35 of fabric, for example, facing the inside surface of the shell, a central shock attenuating structure, generally designated 37, a layer 39 of cushioning material (e.g., a vinyl nitrite foam of the type described above with respect to layer 27 of side pads 11, 13) and an inner facing layer 41 of leather, for example, encasing the sides of the pad and the inner face of the pad, the latter of which is engageable by the head of a person wearing the helmet.
In accordance with this invention, and as illustrated best in FIG. 4, the central shock attenuation structure 37 of each of the front and back pads 7,9 has a breadth (width) greater than its thickness and a breadthwise (widthwise or vertical as shown in the drawings) cross section comprising a series of layers arranged in contiguous side by side relation, the layers being formed by a first plurality of strips, each designated 43, of shock-absorbing material having a relatively high resistance to compression, and a second plurality of strips, each designated 45, of shock-absorbing material having a lower resistance to compression. Layers 45 alternate with layers 43 across the breadth (width) of the structure 37 (vertically as shown in FIG. 4). Strips or layers 43 are preferably of a resilient material, such as a high-density relatively slow-recovery foam. Strips or layers 45 are also preferably of a resilient material, such as a low-density relatively fast-recovery foam. Strips 43 and 45 are suitably joined together at their sides to form a unitary structure. Strips 43 and 45 may be bonded together by adhesive, for example, such as a polyurethane adhesive sold under the trade designation M6586 by Midwest Chemical Company of St. Louis, Mo.
As viewed in cross-section taken breadthwise (widthwise or vertically as shown in FIGS. 4-6) with respect to structure 37, layers 43 and 45 are generally rectangular, each layer having a major dimension D1, constituting its height, and a minor dimension D2, constituting its width or thickness, less than D1. The layers are arranged with their major dimensions D1 generally parallel and extending generally in the direction of the thickness of the structure so that the height of the layers generally corresponds to the thickness of the structure. When the pads 7,9 are mounted on the shell in the manner shown, the major dimension D1 of the layers extends generally at right angles to the inside surface of the shell so that the breadth of the pad is generally perpendicular to the direction of impact force for broadside loading of the structure during an impact.
When loaded, as during an impact to the front or back of the shell 3, the layers 43,45 of a respective pad 7, 9 are adapted to deform in the area of impact for attenuating the shock resulting therefrom. Since layers 43 are of a material having a relatively high resistance to compression, they will absorb most of the impact force by compressing and by deflecting laterally, as shown in FIG. 6. However, layers 45 also absorb some impact force. More importantly, layers 45 provide substantial lateral support to layers 43 and thereby increase the latter's ability to resist lateral deflection and thus to attenuate shock. The lateral support provided by layers 45, together with the fact that layers 43 are preferably of a relatively slow-recovery material, minimizes the "rebound effect" (i.e., the shock felt by the wearer as the shock-absorbing material returns to its undeformed state).
Top pad 15 has a construction similar to that of front and back pads 7 and 9, and corresponding parts are designated by the same reference numerals. The principle difference between pad 15 and pads 7 and 9 is that the structure 37 of pad 15, instead of being formed by numerous relatively narrow strips joined together side by side, is formed by only two such strips joined (e.g., adhesively bonded) at their sides and coiled in spiral form, one strip of the pair, as coiled, forming layers 43 and the other strip of the pair, as coiled, forming layers 45. The convolutions of the coiled strips are also joined (as by adhesive bonding) to form a unitary structure. Structure 37 of pad 15 functions to a attenuate shock in the same manner as structure 37 of pads 7 and 9. Pad 15 is slightly dished in shape to conform to the crown contour of the helmet.
An important advantage of this invention is that, given a set of design parameters, the system S may be engineered to meet virtually any performance requirement over a wide range of requirements. With respect to pads 7, 9 and 15, for example, this may be accomplished by varying the physical properties and characteristics of layers 39 and 41, such as the materials out of which they are made, and the cross-sectional dimensions of the layers. For example, the construction of most football helmets is such that the pad 7 at the front of the helmet is often subjected to greater loads than the back and top pads 9 and 15. Accordingly, layers 43 and 45 of pad 7 are preferably of relatively stiff materials for more effectively absorbing the greater loads. By way of example, layers 43 could be of a high-density relatively slow-recovery polyurethane adhesive, such as is available from Midwest Chemical Company of St. Louis, Mo. under the trade designation M6586, and layers 45 of a high-density (e.g., 2-4 lbs/ft.3) relatively slow-recovery foam such as an ionomer sold under the trade designation "Surlyn" by Gilman Brothers Company of Gilman, Conn. Alternatively, front pad 7 could have a construction identical to the side pads 11, 13. In the back and top pads 9, 15, which may not need to be as stiff as the front pad 7, layers 43 could be of a high-density (e.g., 12 lbs/ft3) relatively slow-recovery foam such as an ionomer sold under the trade designation "Surlyn" by Gilman Brothers Company of Gilman, Conn., and layers 45 could be a low-density (e.g., 2-4 lbs/ft3) relatively fast-recovery foam such as ethylene vinylacetate sold under the trade designation "Evalite" by Monarch Rubber Co. of Bolt, Md. Several additional examples of resilient materials which have been found suitable for use in a protective helmet application are given below.
Layers 43
1. 0.020"-0.030" thick polycarbonate film of the type sold under the trade designation "Lexan" by General Electric Company of Pittsfield, Mass.
2. 0.020"-0.040" thick polycarbonate PET film such as sold by the Plastics and Coatings Division of Mobay Chemical Corporation of Rosemont, Ill.
3. 0.020"-0.060" thick polyethylene film having a density in the range of about 70-90 lbs/ft3.
4. 0.020"-0.060" thick polyurethane film having a density in the range of about 80-100 lbs/ft3.
Layers 45
1. Polyurethane foam of the type sold under the trade designation "Poron" by Rogers Corporation of Rogers, Conn., having a density in the range of about 4-12 lbs/ft3.
2. Vinyl nitrile foam of the type sold under the trade designation "326 Rubatex" by Rubatex Corporation of Bedford, Va.
3. Cross-linked polyethylene foam of the type sold under the trade designation "Ensifoam" by Uniroyal Plastic Products of Warsaw, Ind., and under the trade designation "Volara" by Voltek, Inc. of Lawrence, Mass., having densities in the range of about 4-12 lbs/ft3.
While the materials discussed above are resilient, the use of permanently-deformable non-resilient materials to fabricate layers 43 and/or 45 is also contemplated, at least under certain circumstances, as where the impact loadings are at very high levels. Under such conditions, it has been found that layers 43, for example, may be formed by strips of paper or thin slices of wood.
As alluded to above, the cross-sectional dimensions of layers 43 and 45 are also believed to have an important effect on the ability of structure 37 to absorb and attenuate shock. It is believed, for example, that for maximum effectiveness in attenuating shock, layers 43 should have a slenderness ratio (i.e., the ratio of D1/D2) of 1.0 or greater, so that the layers will not only compress but also tend to buckle (as viewed in cross section) under loading to more effectively absorb the energy of impact. Generally speaking, as the impact load increases, the slenderness ratio of layers 43 should also increase and layers 43 should be formed from materials having a higher resistance to compression in the direction of the loading, thus making structure 37 stiffer for more effectively absorbing the higher impact energies involved. With respect to layers 45, they too should generally have a slenderness ratio of 1.0 or greater, with the slenderness ratio increasing as the impact load increases.
Each pad 7, 9, 11, 13 and 15 is removably mounted on the inside of shell 3 by fastening means comprising one or more two-part fasteners, one part, in the form of a patch 51, of each fastener being secured (e.g., glued) to the respective outer faces 23 or 35 of the pads, and the other part, in the form of a patch 53, of each fastener being secured (e.g., glued) to the interior surface of the shell 3. The two patches 51, 53 of each fastener are preferably formed from a fabric fastening material available commercially under the trademark VELCRO, such as shown in Mestral U.S. Pat. No. 2,717,431, issued Sept. 13, 1955. Thus the patches have cooperable fastening elements thereon which are interengageable for fastening the pad to the shell, and disengageable for removal of the pad from the shell (as for inspection and replacement, if necessary). It will be understood that additional VELCRO patches 53, or even continuous VELCRO strips may be placed around the interior surface of the shell so that the position of the pads may be adjusted to fit the head of the particular person wearing the headgear. The front pad 7 is further secured to the helmet by a strip of webbing 55 fastened to the outer surface of the helmet at its front. Other means for fastening the pads to the helmet may also be used.
In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims (23)

What is claimed is:
1. A shock attenuation structure having a breadth greater than its thickness and a breadthwise cross section comprising a series of layers arranged side-by-side, said series comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said first and second pluralities being disposed in contiguous side-by-side relation across substantially the entire breadth of the structure to form a substantially unitary structure, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of said first plurality, said structure being adapted to be mounted with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, said layers of said first and second pluralities in the area of impact being adapted to deform for attenuating the shock resulting from said impact, with said layers of said second plurality providing lateral support to the layers of said first plurality during said impact.
2. A shock attenuating structure as set forth in claim 1 wherein each layer of said first plurality of layers has a major dimension, constituting its height, and a minor dimension, constituting its width or thickness, less than said major dimension, the layers of said first plurality of layers being arranged with their major dimensions generally parallel and extending generally in the direction of the thickness of said structure whereby the major dimension of one layer generally corresponds to the thickness of said structure.
3. A shock attenuating structure as set forth in claim 2 whereby the slenderness ratio of each layer of said first plurality of layers is 1.0 or greater, the slenderness ratio being the ratio of the height of the layer in cross section to its width in cross section.
4. A shock attenuation structure as set forth in claim 3 wherein the layers of said first plurality of layers are generally rectangular in cross section.
5. A shock attenuation structure as set forth in claim 4 wherein the layers of said first plurality of layers are of a high-density relatively slow-recovery foam.
6. A shock attenuation structure as set forth in claim 5 wherein each layer of said second plurality of layers has a major dimension, constituting its height, and a minor dimension, constituting its width or thickness, the height of the layers of said second plurality of layers being substantially the same as the height of the layers of said first plurality of layers.
7. A shock attenuation structure as set forth in claim 6 wherein the layers of said second plurality of layers are of a low-density relatively fast-recovery foam.
8. A shock attenuation structure as set forth in claim 1 wherein said structure comprises a series of relatively narrow strips joined together side-by-side, said series comprising a first plurality of strips corresponding to said first plurality of layers and a second plurality of strips corrsponding to said second plurality of layers.
9. A shock attenuation structure as set forth in claim 8 wherein said strips are bonded to one another at their sides to form a unitary structure.
10. A shock attenuation structure as set forth in claim 9 wherein said strips are adhesively bonded.
11. A shock attenuation structure as set forth in claim 1 wherein said structure comprises a pair of relatively narrow strips joined at their sides and coiled in spiral form, one strip of said pair, as coiled, forming said first plurality of layers and the other strip of said pair, as coiled, forming said second plurality of layers.
12. Protective apparatus for the head comprising a shell of substantially rigid material adapted to fit on the head and a plurality of separate shock attenuating modules disposed around the inside of the shell for protecting the head, at least one of said modules comprising a shock attenuating structure having a breadth greater than its thickness and a breadthwise cross section comprising a series of layers arranged side-by-side, said series comprising a first plurality of layers of shock-absorbing material having a relatively high resistance to compression and a second plurality of layers of shock-absorbing material having a lower resistance to compression, the layers of said first and second pluralities being disposed in contiguous side-by-side relation across substantially the entire breadth of the structure to form a substantially unitary structure, the layers of said second plurality alternating with the layers of said first plurality across the breadth of the structure and providing lateral support to the layers of the first plurality, said structure being mounted on the inside of the shell with its breadth generally perpendicular to the direction of impact force for broadside loading of the structure during an impact, said layers in the area of impact being adapted resiliently to deform for attenuating the shock resulting from said impact, with said layers of said second plurality providing lateral support to the layers of said first plurality during said impact.
13. Protective apparatus as set forth in claim 12 wherein each layer of said first plurality of layers has a major dimension, constituting its height, and a minor dimension, constituting its width or thickness, less than said major dimension, the layers of said first plurality of layers being arranged with their major dimensions generally parallel and extending generally in the direction of the thickness of said structure whereby the major dimension of one layer generally corresponds to the thickness of said structure.
14. Protective apparatus as set forth in claim 13 wherein the slinderness ratio of each layer of said first plurality of layers is 1.0 or greater, the slenderness ratio being the ratio of the height of the layer in cross section to its width in cross section.
15. Protective apparatus as set forth in claim 14 wherein the layers of said first plurality of layers are generally rectangular in cross section.
16. Protective apparatus as set forth in claim 15 wherein the layers of said first plurality of layers are of a high-density relatively slow-recovery foam.
17. Protective apparatus as set forth in claim 16 wherein each layer of said second plurality of layers has a major dimension, constituting its height, and a minor dimension, constituting its width or thickness, the height of the layers of said second plurality of layers being substantially the same as the height of the layers of said first plurality of layers.
18. Protective apparatus as set forth in claim 17 wherein the layers of said second plurality of layers are of a low-density relatively fast-recovery foam.
19. Protective apparatus as set forth in claim 12 wherein said structure comprises a series of relatively narrow strips joined together side-by-side, said series comprising a first plurality of strips corresponding to said first plurality of layers and a second plurality of strips corresponding to said second plurality of layers.
20. Protective apparatus as set forth in claim 19 wherein said strips are bonded to one another at their sides to form a unitary structure.
21. Protective apparatus as set forth in claim 20 wherein said strips are adhesively bonded.
22. Protective apparatus as set forth in claim 12 wherein said structure comprises a pair of relatively narrow strips joined at their sides and coiled in spiral form, one strip of said pair, as coiled, forming said first plurality of layers and the other strip of said pair, as coiled, forming said second plurality of layers.
23. Protective apparatus as set forth in claim 22 further comprising means for mounting said spiral structure at the crown of the shell for protecting the top of the head, said spiral structure being dished for conforming to the crown of the shell.
US06/643,429 1984-08-23 1984-08-23 Shock attenuation structure Expired - Fee Related US4627114A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US06/643,429 US4627114A (en) 1984-08-23 1984-08-23 Shock attenuation structure
JP60503600A JPS62500037A (en) 1984-08-23 1985-07-31 Shock damping structure
PCT/US1985/001448 WO1986001380A1 (en) 1984-08-23 1985-07-31 Shock attenuation structure
EP19850904032 EP0190281A4 (en) 1984-08-23 1985-07-31 Shock attenuation structure.
CA000489139A CA1245801A (en) 1984-08-23 1985-08-21 Shock attenuation structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/643,429 US4627114A (en) 1984-08-23 1984-08-23 Shock attenuation structure

Publications (1)

Publication Number Publication Date
US4627114A true US4627114A (en) 1986-12-09

Family

ID=24580786

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/643,429 Expired - Fee Related US4627114A (en) 1984-08-23 1984-08-23 Shock attenuation structure

Country Status (5)

Country Link
US (1) US4627114A (en)
EP (1) EP0190281A4 (en)
JP (1) JPS62500037A (en)
CA (1) CA1245801A (en)
WO (1) WO1986001380A1 (en)

Cited By (83)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4912778A (en) * 1989-04-07 1990-04-03 Darleen Daniels Heat reflective skull cap shield for use in hard hats
US5035009A (en) * 1990-09-27 1991-07-30 Riddell, Inc. Protective helmet and liner
US5088130A (en) * 1990-02-06 1992-02-18 Chiarella Michele A Protective helmet having internal reinforcing infrastructure
US5315718A (en) * 1992-04-30 1994-05-31 The United States Of America As Represented By The Secretary Of The Army Protective helmet and retention system therefor
US5475878A (en) * 1992-11-04 1995-12-19 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Adminstration Protective helmet assembly
US5539934A (en) * 1993-11-24 1996-07-30 Ponder; Christopher W. Protective helmet cooling apparatus
WO1996026654A1 (en) * 1995-03-01 1996-09-06 Friedson Ronald S Helmet and/or helmet shell and method for making
US5575017A (en) * 1996-01-02 1996-11-19 Rawlings Sporting Goods Company, Inc. Adjustable baseball batter's helmet
US5655227A (en) * 1993-04-07 1997-08-12 Sundberg; Reino Method of fitting shock-absorbing padding to a helmet shell and a helmet provided with such padding
US5669079A (en) * 1995-10-31 1997-09-23 Morgan; Don E. Safety enhanced motorcycle helmet
US5694649A (en) * 1996-01-02 1997-12-09 Rawlings Sporting Goods Company, Inc. Adjustable baseball batter's and catcher's helmet with mask
US5882205A (en) * 1997-09-09 1999-03-16 Peterson; William S. Training device for soccer
US6070271A (en) * 1996-07-26 2000-06-06 Williams; Gilbert J. Protective helmet
US6128786A (en) * 1997-10-16 2000-10-10 Hos Development Corporation One-size-fits-all helmet
US6219850B1 (en) 1999-06-04 2001-04-24 Lexington Safety Products, Inc. Helmet
US6425141B1 (en) 1998-07-30 2002-07-30 Cerebrix Protective helmet
US20020144432A1 (en) * 2001-04-04 2002-10-10 Mike Dennis Cushioning shoe insole
US6467099B2 (en) * 1998-09-03 2002-10-22 Mike Dennis Body-contact cushioning interface structure
US20040139531A1 (en) * 2002-12-06 2004-07-22 Moore Dan T. Custom fitted helmet and method of making the same
US20040159015A1 (en) * 2003-02-14 2004-08-19 Dennis Michael R. Shoe insole with layered partial perforation
US20050015856A1 (en) * 2003-07-08 2005-01-27 Long Richard J. Adjustable padset for protective helmet
US20050166302A1 (en) * 1998-09-03 2005-08-04 Mjd Innovations, L.L.C. Non-resiliency body-contact protective helmet interface structure
US20050255307A1 (en) * 2004-05-11 2005-11-17 Mjd Innovations, L.L.C. Body-contact interface structure with neutral internal adhesive interface
US20060059606A1 (en) * 2004-09-22 2006-03-23 Xenith Athletics, Inc. Multilayer air-cushion shell with energy-absorbing layer for use in the construction of protective headgear
US20060059605A1 (en) * 2004-09-22 2006-03-23 Xenith Athletics, Inc. Layered construction of protective headgear with one or more compressible layers of thermoplastic elastomer material
US20070083965A1 (en) * 2005-09-20 2007-04-19 Sport Helmets Inc. Lateral displacement shock absorbing material
US20070281125A1 (en) * 2004-08-26 2007-12-06 Moore Dan T Iii Energy-absorbing pads
US7341776B1 (en) 2002-10-03 2008-03-11 Milliren Charles M Protective foam with skin
US20080120764A1 (en) * 2003-12-20 2008-05-29 Peter Sajic Body Protecting Device
US20080136564A1 (en) * 2006-10-23 2008-06-12 Nancy Ann Winfree Mechanical filter for sensors
US20080307568A1 (en) * 2005-10-31 2008-12-18 Peter Sajic Body Protecting Device
US20100000009A1 (en) * 2008-07-02 2010-01-07 Morgan Donald E Compressible Liner for Impact Protection
US20100107317A1 (en) * 2008-11-06 2010-05-06 Mao-Jung Wang Impact-protection safety structure of headwear
USD617503S1 (en) 2010-01-27 2010-06-08 Intellectual Property Holdings, Llc Helmet pad structure
US20100258988A1 (en) * 2005-09-20 2010-10-14 Sport Helmets, Inc. Embodiments of Lateral Displacement Shock Absorbing Technology and Applications Thereof
US20100299813A1 (en) * 2005-06-30 2010-12-02 Morgan Don E Head Protection Apparatus
US20110131695A1 (en) * 2009-12-09 2011-06-09 Maddux Larry E TPU/Foam Jaw Pad
US20110296594A1 (en) * 2010-06-03 2011-12-08 Ip Holdings, Llc Energy management structure
US20120011639A1 (en) * 2010-07-13 2012-01-19 Sport Maska Inc. Helmet with rigid shell and adjustable liner
US20120036620A1 (en) * 2010-08-16 2012-02-16 Kerry Sheldon Harris Helmet padding systems
US20120192337A1 (en) * 2010-04-23 2012-08-02 Guardian Protective Technologies Inc. Blunt force protection headgear technology
US20120297525A1 (en) * 2011-05-23 2012-11-29 Juliana Bain Helmet for Reducing Concussive Forces During Collision
USD679058S1 (en) 2011-07-01 2013-03-26 Intellectual Property Holdings, Llc Helmet liner
US20130086733A1 (en) * 2011-10-10 2013-04-11 Intellectual Property Holdings, Llc Helmet impact liner system
USD683079S1 (en) 2011-10-10 2013-05-21 Intellectual Property Holdings, Llc Helmet liner
US20140096312A1 (en) * 2012-09-12 2014-04-10 Matscitechno Licensing Company Helmet padding system
US20140130240A1 (en) * 2012-07-25 2014-05-15 2nd Skull, LLC Head guard
US8814150B2 (en) 2011-12-14 2014-08-26 Xenith, Llc Shock absorbers for protective body gear
US20140316315A1 (en) * 2013-04-21 2014-10-23 Naoto Ohira Protection member and contact tool
US20140325745A1 (en) * 2013-05-01 2014-11-06 Kranos Ip Corporation Batting helmet
US8915339B2 (en) 2010-12-10 2014-12-23 Skydex Technologies, Inc. Interdigitated cellular cushioning
CN104244755A (en) * 2012-04-24 2014-12-24 贝尔运动股份有限公司 Protective snow and ski helmet
US20150033454A1 (en) * 2013-01-18 2015-02-05 Windpact, Inc. Impact absorbing apparatus
US8950735B2 (en) 2011-12-14 2015-02-10 Xenith, Llc Shock absorbers for protective body gear
US8955169B2 (en) 2011-02-09 2015-02-17 6D Helmets, Llc Helmet omnidirectional energy management systems
USD733972S1 (en) 2013-09-12 2015-07-07 Intellectual Property Holdings, Llc Helmet
US20150264991A1 (en) * 2014-03-24 2015-09-24 Mark Frey Concussive helmet
US20150313305A1 (en) * 2014-05-05 2015-11-05 Crucs Holdings, Llc Impact helmet
US9320311B2 (en) 2012-05-02 2016-04-26 Intellectual Property Holdings, Llc Helmet impact liner system
US9516910B2 (en) 2011-07-01 2016-12-13 Intellectual Property Holdings, Llc Helmet impact liner system
US20170136340A1 (en) * 2015-11-18 2017-05-18 Decoene DRIES Shock absorbing element for the body
US9683622B2 (en) 2004-04-21 2017-06-20 Xenith, Llc Air venting, impact-absorbing compressible members
US9743701B2 (en) 2013-10-28 2017-08-29 Intellectual Property Holdings, Llc Helmet retention system
US9894953B2 (en) 2012-10-04 2018-02-20 Intellectual Property Holdings, Llc Helmet retention system
US20180213875A1 (en) * 2017-01-31 2018-08-02 Impact Solution LLC Football Helmet
US20180271202A1 (en) * 2017-03-21 2018-09-27 Sport Maska Inc. Protective helmet with liner assembly
US10149511B2 (en) 2012-09-28 2018-12-11 Matscitechno Licensing Company Protective headgear system
US20190090573A1 (en) * 2017-09-26 2019-03-28 Tenacious Holdings, Inc. Bump cap
US10350851B2 (en) * 2013-07-23 2019-07-16 Anomaly Action Sports S.R.L. Composite element for protection devices of parts of the human body
US10561192B2 (en) 2011-02-09 2020-02-18 6D Helmets, Llc Omnidirectional energy management systems and methods
US10881162B2 (en) 2015-05-07 2021-01-05 Exero Labs LLC Device for minimizing impact of collisions for a helmet
US10980307B2 (en) * 2017-08-14 2021-04-20 Thomas M. Stade Helmet system
US10993496B2 (en) 2014-02-21 2021-05-04 Matscitechno Licensing Company Helmet padding system
US11253771B2 (en) 2014-02-21 2022-02-22 Matscitechno Licensing Company Helmet padding system
US11297890B2 (en) 2016-03-27 2022-04-12 Impact Solutions Llc Football helmet
US11324273B2 (en) 2011-02-09 2022-05-10 6D Helmets, Llc Omnidirectional energy management systems and methods
US11540577B2 (en) 2020-03-12 2023-01-03 Matscitechno Licensing Company Helmet system
US11540578B2 (en) 2020-03-12 2023-01-03 Matscitechno Licensing Company Helmet system
US11659882B2 (en) 2014-02-21 2023-05-30 Matscitechno Licensing Company Helmet padding system
US11730222B2 (en) 2014-02-21 2023-08-22 Matscitechno Licensing Company Helmet padding system
US11744312B2 (en) 2014-02-21 2023-09-05 Matscitechno Licensing Company Helmet padding system
US11766085B2 (en) 2011-02-09 2023-09-26 6D Helmets, Llc Omnidirectional energy management systems and methods
US12108818B2 (en) 2015-12-18 2024-10-08 Matscitechno Licensing Company Apparatuses, systems and methods for equipment for protecting the human body by absorbing and dissipating forces imparted to the body

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU650848B2 (en) * 1989-05-23 1994-07-07 Frank Anthony Matich Crash helmet
US5713082A (en) * 1996-03-13 1998-02-03 A.V.E. Sports helmet
WO1999002054A1 (en) * 1997-07-09 1999-01-21 Taexpa, S.A. Impact absorption system applicable to head protection helmets
JP6247143B2 (en) * 2014-04-28 2017-12-13 株式会社谷沢製作所 helmet

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US882686A (en) * 1907-07-27 1908-03-24 Robert Ireland Cap for the protection of the human head.
US1652776A (en) * 1927-01-11 1927-12-13 Emanuel N Galanis Miner's cap
US3222697A (en) * 1955-07-05 1965-12-14 Mobay Chemical Corp Profiled polyurethane foam articles of manufacture
US3673609A (en) * 1971-01-27 1972-07-04 Us Navy Protective helmet
US3859666A (en) * 1973-03-19 1975-01-14 Michael T Marietta Crown cushion member
US4101704A (en) * 1976-04-29 1978-07-18 National Research Development Corporation Energy absorbing materials
US4287613A (en) * 1979-07-09 1981-09-08 Riddell, Inc. Headgear with energy absorbing and sizing means
US4343047A (en) * 1980-06-03 1982-08-10 Her Majesty The Queen In Right Of Canada Protective helmets
US4345338A (en) * 1979-10-05 1982-08-24 Gentex Corporation Custom-fitted helmet and method of making same
US4405681A (en) * 1983-01-20 1983-09-20 Milsco Manufacturing Company Foam article and method of preparation
US4427189A (en) * 1979-06-04 1984-01-24 Nissan Motor Co., Ltd. Shock absorbing assembly

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1247206A (en) * 1960-02-05 1960-11-25 Fiberboard mattresses
US3248738A (en) * 1963-05-28 1966-05-03 John T Riddell Inc Protective padding structures
US3843970A (en) * 1973-03-19 1974-10-29 M Marietta Protective headgear
US4484364A (en) * 1980-09-08 1984-11-27 A-T-O Inc. Shock attenuation system for headgear
US4558470A (en) * 1982-10-26 1985-12-17 Figgie International Inc. Shock attenuation system
US4534068A (en) * 1982-10-26 1985-08-13 Figgie International Inc. Shock attenuation system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US882686A (en) * 1907-07-27 1908-03-24 Robert Ireland Cap for the protection of the human head.
US1652776A (en) * 1927-01-11 1927-12-13 Emanuel N Galanis Miner's cap
US3222697A (en) * 1955-07-05 1965-12-14 Mobay Chemical Corp Profiled polyurethane foam articles of manufacture
US3673609A (en) * 1971-01-27 1972-07-04 Us Navy Protective helmet
US3859666A (en) * 1973-03-19 1975-01-14 Michael T Marietta Crown cushion member
US4101704A (en) * 1976-04-29 1978-07-18 National Research Development Corporation Energy absorbing materials
US4427189A (en) * 1979-06-04 1984-01-24 Nissan Motor Co., Ltd. Shock absorbing assembly
US4287613A (en) * 1979-07-09 1981-09-08 Riddell, Inc. Headgear with energy absorbing and sizing means
US4345338A (en) * 1979-10-05 1982-08-24 Gentex Corporation Custom-fitted helmet and method of making same
US4343047A (en) * 1980-06-03 1982-08-10 Her Majesty The Queen In Right Of Canada Protective helmets
US4405681A (en) * 1983-01-20 1983-09-20 Milsco Manufacturing Company Foam article and method of preparation

Cited By (120)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4912778A (en) * 1989-04-07 1990-04-03 Darleen Daniels Heat reflective skull cap shield for use in hard hats
US5088130A (en) * 1990-02-06 1992-02-18 Chiarella Michele A Protective helmet having internal reinforcing infrastructure
US5035009A (en) * 1990-09-27 1991-07-30 Riddell, Inc. Protective helmet and liner
US5315718A (en) * 1992-04-30 1994-05-31 The United States Of America As Represented By The Secretary Of The Army Protective helmet and retention system therefor
US5475878A (en) * 1992-11-04 1995-12-19 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Adminstration Protective helmet assembly
US5655227A (en) * 1993-04-07 1997-08-12 Sundberg; Reino Method of fitting shock-absorbing padding to a helmet shell and a helmet provided with such padding
US5539934A (en) * 1993-11-24 1996-07-30 Ponder; Christopher W. Protective helmet cooling apparatus
WO1996026654A1 (en) * 1995-03-01 1996-09-06 Friedson Ronald S Helmet and/or helmet shell and method for making
US5669079A (en) * 1995-10-31 1997-09-23 Morgan; Don E. Safety enhanced motorcycle helmet
US5575017A (en) * 1996-01-02 1996-11-19 Rawlings Sporting Goods Company, Inc. Adjustable baseball batter's helmet
US5694649A (en) * 1996-01-02 1997-12-09 Rawlings Sporting Goods Company, Inc. Adjustable baseball batter's and catcher's helmet with mask
US6070271A (en) * 1996-07-26 2000-06-06 Williams; Gilbert J. Protective helmet
US5882205A (en) * 1997-09-09 1999-03-16 Peterson; William S. Training device for soccer
US6128786A (en) * 1997-10-16 2000-10-10 Hos Development Corporation One-size-fits-all helmet
US6425141B1 (en) 1998-07-30 2002-07-30 Cerebrix Protective helmet
US6467099B2 (en) * 1998-09-03 2002-10-22 Mike Dennis Body-contact cushioning interface structure
US20050166302A1 (en) * 1998-09-03 2005-08-04 Mjd Innovations, L.L.C. Non-resiliency body-contact protective helmet interface structure
US20090031481A1 (en) * 1998-09-03 2009-02-05 Dennis Michael R Protective helmet pad interface structure
US7299505B2 (en) 1998-09-03 2007-11-27 Mjd Innovations, Llc Helmet cushioning pad with variable, motion-reactive applied-load response, and associated methodology
US6434755B1 (en) 1999-06-04 2002-08-20 Southern Impact Research Center, Llc Helmet
US6219850B1 (en) 1999-06-04 2001-04-24 Lexington Safety Products, Inc. Helmet
US7107704B2 (en) 2001-04-04 2006-09-19 Mjd Innovations, L.L.C. Cushioning shoe insole
US20020144432A1 (en) * 2001-04-04 2002-10-10 Mike Dennis Cushioning shoe insole
US7341776B1 (en) 2002-10-03 2008-03-11 Milliren Charles M Protective foam with skin
US20050050617A1 (en) * 2002-12-06 2005-03-10 Moore Dan T. Custom fitted helmet and method of making the same
US20040139531A1 (en) * 2002-12-06 2004-07-22 Moore Dan T. Custom fitted helmet and method of making the same
US20040159015A1 (en) * 2003-02-14 2004-08-19 Dennis Michael R. Shoe insole with layered partial perforation
US6883181B2 (en) * 2003-07-08 2005-04-26 Gentex Corporation Adjustable padset for protective helmet
US20050015856A1 (en) * 2003-07-08 2005-01-27 Long Richard J. Adjustable padset for protective helmet
US8082599B2 (en) * 2003-12-20 2011-12-27 Lloyd (Scotland) Limited Body protecting device
US20080120764A1 (en) * 2003-12-20 2008-05-29 Peter Sajic Body Protecting Device
US9683622B2 (en) 2004-04-21 2017-06-20 Xenith, Llc Air venting, impact-absorbing compressible members
US20050255307A1 (en) * 2004-05-11 2005-11-17 Mjd Innovations, L.L.C. Body-contact interface structure with neutral internal adhesive interface
US20070281125A1 (en) * 2004-08-26 2007-12-06 Moore Dan T Iii Energy-absorbing pads
US8399085B2 (en) 2004-08-26 2013-03-19 Intellectual Property Holdings, Llc Energy-absorbing pads
US8039078B2 (en) 2004-08-26 2011-10-18 Intellectual Property Holdings, Llc Energy-absorbing pads
US20060059605A1 (en) * 2004-09-22 2006-03-23 Xenith Athletics, Inc. Layered construction of protective headgear with one or more compressible layers of thermoplastic elastomer material
US20060059606A1 (en) * 2004-09-22 2006-03-23 Xenith Athletics, Inc. Multilayer air-cushion shell with energy-absorbing layer for use in the construction of protective headgear
US20080155735A1 (en) * 2005-02-16 2008-07-03 Xenith, Llc Energy-Absorbing Liners and Shape Conforming Layers for Use with Pro-Tective Headgear
US20100299813A1 (en) * 2005-06-30 2010-12-02 Morgan Don E Head Protection Apparatus
US7677538B2 (en) * 2005-09-20 2010-03-16 Sport Helmets Inc. Lateral displacement shock absorbing material
US20070083965A1 (en) * 2005-09-20 2007-04-19 Sport Helmets Inc. Lateral displacement shock absorbing material
US20100258988A1 (en) * 2005-09-20 2010-10-14 Sport Helmets, Inc. Embodiments of Lateral Displacement Shock Absorbing Technology and Applications Thereof
US20080307568A1 (en) * 2005-10-31 2008-12-18 Peter Sajic Body Protecting Device
US20080136564A1 (en) * 2006-10-23 2008-06-12 Nancy Ann Winfree Mechanical filter for sensors
US7706213B2 (en) 2006-10-23 2010-04-27 Nancy Ann Winfree Mechanical filter for sensors
US20110107503A1 (en) * 2008-07-02 2011-05-12 Donald Edward Morgan Compressible Liner for Impact Protection
US20100000009A1 (en) * 2008-07-02 2010-01-07 Morgan Donald E Compressible Liner for Impact Protection
US20100107317A1 (en) * 2008-11-06 2010-05-06 Mao-Jung Wang Impact-protection safety structure of headwear
US20110131695A1 (en) * 2009-12-09 2011-06-09 Maddux Larry E TPU/Foam Jaw Pad
US8387164B2 (en) * 2009-12-09 2013-03-05 Kranos Ip Corporation Plastic foam helmet pad
US8201269B2 (en) * 2009-12-09 2012-06-19 Kranos Ip Corporation TPU/foam jaw pad
US20120198605A1 (en) * 2009-12-09 2012-08-09 Kranos Ip Corporation Tpu/foam jaw pad
USD617503S1 (en) 2010-01-27 2010-06-08 Intellectual Property Holdings, Llc Helmet pad structure
US20120192337A1 (en) * 2010-04-23 2012-08-02 Guardian Protective Technologies Inc. Blunt force protection headgear technology
US8726424B2 (en) * 2010-06-03 2014-05-20 Intellectual Property Holdings, Llc Energy management structure
US20110296594A1 (en) * 2010-06-03 2011-12-08 Ip Holdings, Llc Energy management structure
US20140318911A1 (en) * 2010-06-03 2014-10-30 Intellectual Property Holdings, Llc Energy management structure
US20120011639A1 (en) * 2010-07-13 2012-01-19 Sport Maska Inc. Helmet with rigid shell and adjustable liner
US9226539B2 (en) * 2010-07-13 2016-01-05 Sport Maska Inc. Helmet with rigid shell and adjustable liner
US20120036620A1 (en) * 2010-08-16 2012-02-16 Kerry Sheldon Harris Helmet padding systems
US8915339B2 (en) 2010-12-10 2014-12-23 Skydex Technologies, Inc. Interdigitated cellular cushioning
US10197125B2 (en) 2010-12-10 2019-02-05 Skydex Technologies, Inc. Interdigitated cellular cushioning
US9603407B2 (en) 2010-12-10 2017-03-28 Skydex Technologies, Inc. Interdigitated cellular cushioning
US10980306B2 (en) 2011-02-09 2021-04-20 6D Helmets, Llc Helmet omnidirectional energy management systems
US11324273B2 (en) 2011-02-09 2022-05-10 6D Helmets, Llc Omnidirectional energy management systems and methods
US10561192B2 (en) 2011-02-09 2020-02-18 6D Helmets, Llc Omnidirectional energy management systems and methods
US11766085B2 (en) 2011-02-09 2023-09-26 6D Helmets, Llc Omnidirectional energy management systems and methods
US9820525B2 (en) 2011-02-09 2017-11-21 6D Helmets, Llc Helmet omnidirectional energy management systems
US8955169B2 (en) 2011-02-09 2015-02-17 6D Helmets, Llc Helmet omnidirectional energy management systems
US20120297525A1 (en) * 2011-05-23 2012-11-29 Juliana Bain Helmet for Reducing Concussive Forces During Collision
US9119431B2 (en) * 2011-05-23 2015-09-01 Juliana Bain Helmet for reducing concussive forces during collision
USD679058S1 (en) 2011-07-01 2013-03-26 Intellectual Property Holdings, Llc Helmet liner
US9516910B2 (en) 2011-07-01 2016-12-13 Intellectual Property Holdings, Llc Helmet impact liner system
USD683079S1 (en) 2011-10-10 2013-05-21 Intellectual Property Holdings, Llc Helmet liner
US20130086733A1 (en) * 2011-10-10 2013-04-11 Intellectual Property Holdings, Llc Helmet impact liner system
US20190208853A1 (en) * 2011-10-14 2019-07-11 Windpact, Inc. Impact absorbing apparatus
US11083237B2 (en) 2011-10-14 2021-08-10 Windpact, Inc. Impact absorbing apparatus
US8950735B2 (en) 2011-12-14 2015-02-10 Xenith, Llc Shock absorbers for protective body gear
US8814150B2 (en) 2011-12-14 2014-08-26 Xenith, Llc Shock absorbers for protective body gear
CN104244755A (en) * 2012-04-24 2014-12-24 贝尔运动股份有限公司 Protective snow and ski helmet
JP2015514886A (en) * 2012-04-24 2015-05-21 ベル スポーツ, インコーポレイテッド Protective helmet for snow and ski
US9320311B2 (en) 2012-05-02 2016-04-26 Intellectual Property Holdings, Llc Helmet impact liner system
US20140130240A1 (en) * 2012-07-25 2014-05-15 2nd Skull, LLC Head guard
US20140096312A1 (en) * 2012-09-12 2014-04-10 Matscitechno Licensing Company Helmet padding system
US10149511B2 (en) 2012-09-28 2018-12-11 Matscitechno Licensing Company Protective headgear system
US10595578B2 (en) 2012-10-04 2020-03-24 Intellectual Property Holdings, Llc Helmet retention system
US9894953B2 (en) 2012-10-04 2018-02-20 Intellectual Property Holdings, Llc Helmet retention system
US10039338B2 (en) * 2013-01-18 2018-08-07 Windpact, Inc. Impact absorbing apparatus
US20150033454A1 (en) * 2013-01-18 2015-02-05 Windpact, Inc. Impact absorbing apparatus
US20140316315A1 (en) * 2013-04-21 2014-10-23 Naoto Ohira Protection member and contact tool
US20140325745A1 (en) * 2013-05-01 2014-11-06 Kranos Ip Corporation Batting helmet
US9566497B2 (en) * 2013-05-01 2017-02-14 Kranos Ip Corporation Batting helmet
US10583346B2 (en) 2013-05-01 2020-03-10 Kranos Ip Corporation Liner assembly for a protective helmet
US9943747B2 (en) 2013-05-01 2018-04-17 Kranos Ip Corporation Liner assembly for a protective helmet
US10350851B2 (en) * 2013-07-23 2019-07-16 Anomaly Action Sports S.R.L. Composite element for protection devices of parts of the human body
USD733972S1 (en) 2013-09-12 2015-07-07 Intellectual Property Holdings, Llc Helmet
US9743701B2 (en) 2013-10-28 2017-08-29 Intellectual Property Holdings, Llc Helmet retention system
US10993496B2 (en) 2014-02-21 2021-05-04 Matscitechno Licensing Company Helmet padding system
US11253771B2 (en) 2014-02-21 2022-02-22 Matscitechno Licensing Company Helmet padding system
US11730222B2 (en) 2014-02-21 2023-08-22 Matscitechno Licensing Company Helmet padding system
US11659882B2 (en) 2014-02-21 2023-05-30 Matscitechno Licensing Company Helmet padding system
US11744312B2 (en) 2014-02-21 2023-09-05 Matscitechno Licensing Company Helmet padding system
US9975032B2 (en) * 2014-03-24 2018-05-22 Mark Frey Concussive helmet
US20150264991A1 (en) * 2014-03-24 2015-09-24 Mark Frey Concussive helmet
US20150313305A1 (en) * 2014-05-05 2015-11-05 Crucs Holdings, Llc Impact helmet
US10881162B2 (en) 2015-05-07 2021-01-05 Exero Labs LLC Device for minimizing impact of collisions for a helmet
US20170136340A1 (en) * 2015-11-18 2017-05-18 Decoene DRIES Shock absorbing element for the body
US12108818B2 (en) 2015-12-18 2024-10-08 Matscitechno Licensing Company Apparatuses, systems and methods for equipment for protecting the human body by absorbing and dissipating forces imparted to the body
US11297890B2 (en) 2016-03-27 2022-04-12 Impact Solutions Llc Football helmet
US11039653B2 (en) * 2017-01-31 2021-06-22 Impact Solution LLC Football helmet
US20180213875A1 (en) * 2017-01-31 2018-08-02 Impact Solution LLC Football Helmet
US20180271202A1 (en) * 2017-03-21 2018-09-27 Sport Maska Inc. Protective helmet with liner assembly
US11517065B2 (en) 2017-03-21 2022-12-06 Sport Maska Inc Protective helmet with liner assembly
US10455884B2 (en) * 2017-03-21 2019-10-29 Sport Maska Inc. Protective helmet with liner assembly
US10980307B2 (en) * 2017-08-14 2021-04-20 Thomas M. Stade Helmet system
US10779599B2 (en) * 2017-09-26 2020-09-22 Tenacious Holdings, Inc. Bump cap
US20190090573A1 (en) * 2017-09-26 2019-03-28 Tenacious Holdings, Inc. Bump cap
US11540578B2 (en) 2020-03-12 2023-01-03 Matscitechno Licensing Company Helmet system
US11540577B2 (en) 2020-03-12 2023-01-03 Matscitechno Licensing Company Helmet system

Also Published As

Publication number Publication date
CA1245801A (en) 1988-12-06
EP0190281A4 (en) 1987-01-10
WO1986001380A1 (en) 1986-03-13
EP0190281A1 (en) 1986-08-13
JPS62500037A (en) 1987-01-08

Similar Documents

Publication Publication Date Title
US4627114A (en) Shock attenuation structure
US4558470A (en) Shock attenuation system
US20200253314A1 (en) Omnidirectional energy management systems and methods
US4534068A (en) Shock attenuation system
US10980306B2 (en) Helmet omnidirectional energy management systems
US4422183A (en) Protective body shield
US5956777A (en) Helmet
US9622533B2 (en) Single-layer padding system
US3629882A (en) Energy dissipating support device
US3882547A (en) Padding structure
US8069498B2 (en) Protective arrangement
US5669079A (en) Safety enhanced motorcycle helmet
US7677538B2 (en) Lateral displacement shock absorbing material
US4472472A (en) Protective device
CA3137920C (en) Helmet impact attenuation liner
CN107847002B (en) Helmet omnidirectional energy management system and method
US9603408B2 (en) Football helmet having improved impact absorption
US20020184699A1 (en) Protective helmet
CN112515278A (en) Impact absorbing apparatus
JPH0423004B2 (en)
US20220322780A1 (en) Omnidirectional energy management systems and methods
US20240000182A1 (en) Lattice Structure for Impact Attenuation
CA1207951A (en) Shock attenuation system

Legal Events

Date Code Title Description
AS Assignment

Owner name: FIGGIE INTERNATIONAL INC. WILLOUGHBY OHIO A CORP O

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MITCHELL, HAL D.;REEL/FRAME:004340/0327

Effective date: 19840821

Owner name: FIGGIE INTERNATIONAL INC.,OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MITCHELL, HAL D.;REEL/FRAME:004340/0327

Effective date: 19840821

AS Assignment

Owner name: FIGGIE INTERNATIONAL INC.

Free format text: MERGER;ASSIGNOR:FIGGIE INTERNATIONAL INC., (MERGED INTO) FIGGIE INTERNATIONAL HOLDINGS INC. (CHANGED TO);REEL/FRAME:004767/0822

Effective date: 19870323

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 19901209

AS Assignment

Owner name: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT, IL

Free format text: SECURITY INTEREST;ASSIGNOR:RAWLINGS SPORTING GOODS COMPANY, INC.;REEL/FRAME:010841/0564

Effective date: 19991228

LAPS Lapse for failure to pay maintenance fees

Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: RAWLINGS SPORTING GOODS COMPANY, INC., MISSOURI

Free format text: TERMINATION AND RELEASE OF SECURITY INTEREST IN PA;ASSIGNOR:GENERAL ELECTRIC CAPITAL CORPORATION;REEL/FRAME:013887/0688

Effective date: 20030327